<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="imagetoolbar" content="no"> <!--ie image gizmo OFF!-->
    <style type="text/css">
        #map {
            width: 512px;
            height: 512px;
            border: 1px solid black;
        }
    </style>
    <script src="../lib/OpenLayers.js"></script>
    <script type="text/javascript">
        <!--
        var map, layer;
        var size, icon;
        
        function init(){
            map = new OpenLayers.Map('map');
            layer = new OpenLayers.Layer.WMS( "OpenLayers WMS", 
                "http://labs.metacarta.com/wms/vmap0", {layers: 'basic'} );
                
            map.addLayer(layer);
            var markers = new OpenLayers.Layer.Markers( "Markers" );
            map.addLayer(markers);

            size = new OpenLayers.Size(50,50);
            calculateOffset = function(size) {
                        return new OpenLayers.Pixel(-(size.w/2), -size.h); };
            icon = new OpenLayers.Icon(
                'http://boston.openguides.org/markers/AQUA.png',
                size, null, calculateOffset);
            markers.addMarker(
                new OpenLayers.Marker(new OpenLayers.LonLat(-180,90), icon));

            map.addControl(new OpenLayers.Control.LayerSwitcher());
            map.zoomToFullExtent();
        }

        function resize() {
         
            size = new OpenLayers.Size(size.w + 10, size.h + 10);
            icon.setSize(size);   
            
        }
        // -->
    </script>
  </head>
  <body onload="init()">
    <h1>OpenLayers Example</h1>
    <div id="map"></div>
    <div style="background-color:purple" onclick="resize()"> click to resize marker</div>
  </body>
</html>
